*{
    padding: 0;
    margin: 0;
    font-size: 14px;
    color: #242424;
    -webkit-user-select: none;
}

#box{
    width: 200px;
    height: 200px;
    position: absolute;
    top: 0;
    left: 0;
    
    background: red;
    cursor: move;
}

body,html{
    width: 100%;
    height: 100%;
}